Aluminon

VII,10. AMMONIUM SALT OF AURIN TRICARBOXYLIC ACID ( ALUMINON )... 

Formaldehyde condenses with sahcyhc acid in the presence of nitrite-containing sulphuric acid to give aurin tiicarboxyhc acid this is converted by ammonia solution into the ammonium salt, which is employed as a reagent for aluminium ( aluminon ) ... 

Aurin tricarboxylic acid [4431-00-9] M 422.4, m 300". The acid is dissolved in aqueous NaOH, NaHS03 solution is added until the colour is discharged and then the tricarboxylic acid is ppted with HCI [Org Synth Coll Vol I 54 1947]. Do not extract the acid with hot water because it softens forming a viscous mass. Make a solution by dissolving in aqueous NH3. See Aluminon for the ammonium salt. 

Aluminum was quantitatively determined by spectrophotometry (Amax 540 nm) after extracting from silica layer with double-distilled water and developing the color with 0.1% aqueous aluminon. 

To examine the cavitational effect of ultrasound on bright-red complex of aluminon adsorbed on Al(OH)3, in our experiments, 25 ml of 0.005 M aluminium sulphate was treated with 5 ml of 1% aluminon (triammonium aurine-tricarboxylate). This adsorption complex was sonicated for 10, 20 and 30 min, while the control sample was agitated for the same duration with a magnetic stirrer. The turbidity in sonicated sample increased, as time of sonication increased compared to the unsonicated condition (Table 9.18 and Fig. 9.4). In sonicated sample, the colour of the adsorption complex was dark compared to the control sample and the settlement of the adsorption complex was also slower due to the smaller size particle of the complex. 

Ultrasound could play a dual role of creating higher interfacial area as well as facilitating the process of interfacial transport. This phenomenon seemed to be responsible for the increase in the colour intensity of the solution of Al3+-aluminon adsorption complex and could be explained as follows. 

Table 9.18 Turbidity in Al3+ - aluminon complex after sonication/agitation Time (min) of Turbidity (NTU) ...

Allyl mercaptan, p205 Allyl sulfide, d34 Allyl trichloride, t247 Aluminon, a306 A-Amidinosarcosine, c301... 

Aluminon (qualitative test for aluminum). The reagent consists of 0.1% solution of the ammonium salt of aurin tricarboxylic acid. A bright red precipitate, persisting in alkaline solution, indicates aluminum. 

Aurin tricarboxylate (also known as aluminon) forms fairly stable complexes with beryllium Log Kx values of 5.38 (160) and 4.54 (161) have been reported. In the 1950s this ligand was examined as a possible antidote to beryllium poisoning in rats, but although it reduced the toxicity, serious side effects were noted for further details see the review by Wong and Woollins (20). 

Aluminium amalgam, 198, 514 Aluminium tert.-butoxide, 887 Aluminium tso-propoxide, 883 reductions with, 882, 883-886 Aluminon, 959, 960... 

Aluminon, haematoxylin, eriochiome cyanine B, alizarin S, quinalizarin, oxine,b morin,c pontachrome blue black Rc... 

Acac,b morin,c aluminon, thorin Dithizone,b XO, HQBA,b oxine,b NaDDCb Carminic acid, curcumin, dianthrimide Dithizone... 

Coagulant. Stock solutions were 10"2Af in reagent grade A1(C104)3 and 10-1M in HC104. Aluminum determinations for the standardization of stock solutions were made by alkalimetric titration. The amount of residual dissolved aluminum in adsorption experiments was determined absorptiometrically using aluminon (14). The agreement between both... 

Aluminum in solution of its salts is detected by the reaction (1) with ammonium salt of aurin tricarboxylic acid ( aluminon ), which yields a red precipitate persisting in NH4OH solution, (2) with alizarin red S. which yields a bright red precipitate persisting in acetic acid solution. 

Allyl sulfide, d27 Aluminon, a316 A-Amidinosarcosine, c277 Aminoacetaldehyde diethyl acetal, d254... 

Aluminon (a solution of the ammonium salt of aurine tricarboxylic acid) Quinalizarin, alizarin-S, alizarin Chromium (III), Cr3 Ammonia solution... 

Rare earths Sulfosalicylic acid Aluminon (aurintricarboxylic acid) Sensitivity 6 pg/ml [117]... 

Dissolve a small portion of the ppt. in 1 ml hot dilute HC1. Cool, add 1 ml 10m ammonium acetate solution and 0-5 ml of the aluminon reagent. Stir the solution and render basic with ammonium carbonate solution. A red ppt. confirms the presence of A1 (4). 

Confirm A1 thus centrifuge, wash with a few drops of water, dissolve the ppt. in dilute HC1, add 0-3 ml ammonium acetate solution and 1 drop of the aluminon reagent. Mix, allow to stand for 30 seconds, and render alkaline with ammoniacal ammonium carbonate solution. A red ppt. confirms Al. 

Aluminon (01%). Dissolve 01 g aluminon (tri-ammonium-aurine-tri-carboxylate), C22H1409, in 100 ml water. 

Materials. Book papers dating from about 1790 to 1983 and provided by the Library of Congress were used. The book documents were selected at approximately 10-year intervals and are listed in Table I. Whatman filter paper was used as a cellulosic sample. The fiber sources of the paper documents were determined by a staining technique developed by Graff (5). The aluminon test (6) and Raspail test (7) were performed to determine the presence of alums and rosins, respectively, in paper documents. For comparison purposes, pH values of paper documents were obtained by cold-distilled-water extraction of 1 g of paper for 1 h. 

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